A cryptid of American origin. In the mid-1960s, there were some sightings of a great winged creature with massive reddish eyes. It is thought (outside of cryptozoology) that these might actually be misconstrued sandhill cranes or barn owls.
Mothman can be encountered in the Ikebukuro Tunnel as a random encounter. Due to being a demon of the Wilder race, the Demi-fiend cannot speak to them unless he either uses the Jive Talk conversation skill if he has it or encounters one in a dazed demon state during the Full Kagutsuchi.
A Mothman with the most powerful multi-target elemental spells can be purchased from a Shady Broker in the Labyrinth of Amala for 50,000 Macca.
"An elusive creature first sighted in West Virginia, USA in the 1960s. About two meters in height, the Mothman wears no clothes and has a pair of giant wings on its back. It can fly at amazing speeds, and those who witness it catch only a fleeting glimpse. As a result, very little is known about it. The area where it has been spotted are also well known for U.F.O. sightings, fueling speculation that the Mothman itself may be an extraterrestrial."
—Shin Megami Tensei IMAGINE compendium
Mothman can be encountered within Nakano Stone Site's silver-level instance and is one of the two final bosses that can appear within the Old Metro instance. He appears as an NPC with DB Saitou in the later docks act and Diaspora where he offers cryptic warnings.
Mothman can be found on the lowest level of Naraku, just before the encounter with Medusa. Flynn will need the Demolingual App in order to be able to communicate with them. Mothman can teach Flynn the Shibaboo and Tarukaja skills through its Demon Whisper. Mothman is one of the demons needed to summon Plasma through special fusion.
"A cryptid sighted during the 60s-80s in West Virginia. It has shining red eyes and is named for the fin-like appendages on its sides. It uses its keen sense for blood to track down the source and feed on it."
—Persona 5 background
Mothman is the sixth Persona of the Moon Arcana and can be found as a Shadow in Okumura's Palace and the Adyeshach area of Mementos, with the title "Vampire Moth." It is the first Persona to learn the Shock Boost skill. When itemized through Electric Chair execution in the Velvet Room, Mothman yields a Foul Breath skill card.
"A cryptid sighted in West Virginia from the 1960s to 1980s. It has red, shining eyes and was known for the finlike appendages on the sides of its body. It's said to walk on two feet and fly without moving its appendages. It can keenly sense blood to track its source and feed on it. Eyewitnesses say that a UFO was sighted when Mothman appeared, so some believe that it is actually an alien."
"A cryptid sighted in the USA from the 1960s to the 1980s. It has red, shining eyes and was known for the fin-like appendages on the sides of its body. It's said to walk on two feet and fly without moving its appendages. It can keenly sense blood to track its source and feed on it. Eyewitnesses say that a UFO was sighted when Mothman appeared, so some believe that it is actually an alien."